[racket] display problem

From: Danny Yoo (dyoo at cs.wpi.edu)
Date: Thu Apr 5 14:29:10 EDT 2012

> I start with this :
>
> aaaaa|


Concretely, what does the editor world value look like at this point?
You're representing the state somewhat ambiguously.  Can you represent
the above in terms of (make-editor ... ...)?




> now someone press 3 times the left key.
> So I have  aa/aaa


Similarly, what does the world value look like at this point?


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